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Inventions 2020, 5, x FOR PEER REVIEW 9 of 14 For the console panel, Web3-Ethereum JavaScript API is used in the project [25]. “Web3.js” is a selection of libraries that facilitates communication with local Ethereum node via IPC or HTTP Inventions 2020, 5, 58 9 of 14 connection. A deploy file and script codes are developed using HD wallet provider and web3. The HD wallet, with a public/private key tree feature, represented a master node (Meta Mask). Meta Mask Inventions 2020, 5, x FOR PEER REVIEW 9 of 14 is a crypto wallet for blockchain, which offers a risk-free approach on a unique decentralized web in blockchain database and can be retrieved only by authorized users. Figure 4 shows the construction platform to link up to blockchain-based programs [26]. Moreover, Application Binary Interface (ABI) flowchart of Smart Contract and its interaction with a different layer of the SCADA system. The data For the console panel, Web3-Ethereum JavaScript API is used in the project [25]. “Web3.js” is a specification is used as a standard approach to communicate with contracts in the Ethereum monitoring is developed in Python Zerynth IDE environment [22], and the communication layer for selection of libraries that facilitates communication with local Ethereum node via IPC or HTTP environment. smart RTUs is made with microchips of espressif [23]. connection. A deploy file and script codes are developed using HD wallet provider and web3. The HD wallet, with a public/private key tree feature, represented a master node (Meta Mask). Meta Mask i s a crypto wallet for blockchain, which offers a risk-free approach on a unique decentralized web SCADA, Communication Cloud, Communication link RTU, Sensor platform to link up to blockchain-based programs [26]. Moreover, Applicat I) speciSfeicravteiornopiseruatsieodn:aResadaingsfrtoamntdheaBrldockachpaipnroach to communicate with contracts in the Ethereum environment. Web3 HTML Docs JS Asset Server Data Collection Layer Communication Layer Optimization Layer Data Collection Layer Server operation:Reading from the Blockchain Transaction Data processing in RTU, Sensor ioCnomBimnaurnyicInateiorfnacLeay(AerB SCADA, Energy Management Communication Metamask Web3 HTML Docs Rinkeby Server Module JS Asset Cloud, Communication link Writingoperation:on Blockchainbyclient Figure4.TheConstructionflowchDaartaopfrSomceassritnCgoinntract.OptimizationLayer Transaction Energy Management Figure 4. The Construction flowchart of Smart Contract. Metamask Rinkeby Module Zerynth is designed to link the IoT platforms of smart RTU to cloud services. Figure 5 shows sampleimopof rat sstrmeaamrst contract script developed for th#eCloncfiaglurEatihonerfieleum node operation in blockchain. Writingoperation:on Blockchainbyclient # Ethereum modules import config Verified smart contract data is then transferred to Rinkeby (refer to Figure 4), which is a platform of from blockchain.ethereum import ethereum import math the Ethereum blockchain test network (test net) [24]. Rinkeby test net, in contrast to Ethereum main from blockchain.ethereum import rpc import json network (main net) is an authorized network. import requests # WiFi drivers Figure 4. The Construction flowchart of Smart Contract. from espressif.esp32net import esp32wifi as net_driver # import Real-Time Clock module # for ESP-8266 import streams # from broadcom.bcm43362 import bcm43362 as # Ethereum modules net_driver from blockchain.ethereum import ethereum # for Particle Photon from blockchain.ethereum import rpc from wireless import wifi # WiFi drivers # SSL module for https from espressif.esp32net import esp32wifi as net_driver import ssl # for ESP-8266 #to read from analogue sensor # from broadcom.bcm43362 import bcm43362 as import adc net_driver # for Particle Photon from wireless import wifi Figure 5. A Smart contract script f # SSL module for https import ssl ata Transaction Process for Mining #to read from analogue sensor import adc Ethereum is an electronic currency used for f #import rtc # Configuration file import timers import config t=timers.timer() import math t.start() import json import requests def get_epoch(): user_agent = {"user-agent": "curl/7.56.0"} # import Real-Time Clock module return #import rtc int(json.loads(requests.get("http://now.zerynth.com/", import timers headers=user_agent).content)['now']['epoch']) t=timers.timer() t.start() def get_epoch(): or local Ethereum node operation. user_agent = {"user-agent": "curl/7.56.0"} return int(json.loads(requests.get("http://now.zerynth.com/", headers=user_agent).content)['now']['epoch']) unds exchange in an encrypted system which D 4.5. does not depend on any legalized central banking system. The blockchain transaction system in Ethereum Figure 5. A Smart contract script for local Ethereum node operation. data framework as Foingluinre5p. aAySmeanrt csoynstreamct isscrdipetscforirbleodcailnEtheirsesuemctniond.e operation. Ethereum employs public keys to address deposits and send currency. The public keys also track For the console panel, Web3-Ethereum JavaScript API is used in the project [25]. “Web3.js” is 4.5. Data Transaction Process for Mining the transaction details. In Ethereum blockchain systems, data exchanges or transactions are usually a selection of libraries that facilitates communication with local Ethereum node via IPC or HTTP unseen and anonymous. The system fixes the “trust” issue in between nodes with its anonymity connEectthieorne.uAmdiespalnoyelfielcetraonndicscruiprrtecnocdyeus saerde dfoervfeulonpdesdeuxscihnagnHgeDinwanlletnpcroyvpitdeedrsaynsdtewmewb3h. iTchedHoeDs feature. Knowing a blockchain address provides the transaction details, which have two major nwoatlldeet,pwenitdhoanpaunbylicle/pgrailvizaetedkceyntraelebfaenatkuinreg,sreypstremse.nTtehdeablmocaksctehraninodtrean(MsaectaioMnassyks)t.emMeintaEMthaesrkeuisma sections: dcraytpatforawmaellwetofrokrabslocnklcihnaeipn,awymhiecnhtosffyesrtesmariiskd-efsreceribapedprionatchisonseactuionniq.uedecentralizedwebplatform Principal data: It features the details of transaction files, records, dealing, contract history, and tolinEktuhperteoubmlocekmchpaloiny-sbpausebdlipcrkoegyrsatmosa[d2d6]r.esMsodrepoovseirt,sAapnpdlisceantdiocnuBrirneanrcyI.nTtherefapcueb(lAicBkI)esypseaclisfioctartaiockn bank clearing information. tihseustreadnassacatisotnandeatradilsa.pIpnroEathcherteoucmomblmocukncihcatinewsyisthtecmosn,trdacttaseinxcthaenEgtehseroerutmranensavcitrionmseanret.usually unseen and anonymous. The system fixes the “trust” issue in between nodes with its anonymity feature. Knowing a blockchain address provides the transaction details, which have two major sections: Principal data: It features the details of transaction files, records, dealing, contract history, and bank clearing information.PDF Image | Ethereum Blockchain-Based Prototype for Data Security
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